syzbot

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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888103e9f870 of 4 bytes by task 17125 on cpu 1:
 io_get_sqe io_uring/io_uring.c:2385 [inline]
 io_submit_sqes+0x242/0x1060 io_uring/io_uring.c:2436
 __do_sys_io_uring_enter io_uring/io_uring.c:3709 [inline]
 __se_sys_io_uring_enter+0x1eb/0x1b70 io_uring/io_uring.c:3643
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3643
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103e9f870 of 4 bytes by task 17248 on cpu 0:
 io_sqring_full io_uring/io_uring.h:256 [inline]
 io_uring_poll+0xcd/0x190 io_uring/io_uring.c:3016
 vfs_poll include/linux/poll.h:88 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x636/0xc00 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1101
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1101
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00004fc0 -> 0x00004fc6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17248 Comm: syz-executor.5 Tainted: G        W          6.6.0-syzkaller-16176-g1b907d050735 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
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